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<?php declare(strict_types=1);
/*
* This file is part of Composer.
*
* (c) Nils Adermann <naderman@naderman.de>
* Jordi Boggiano <j.boggiano@seld.be>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Composer\DependencyResolver;
use Composer\Filter\PlatformRequirementFilter\IgnoreListPlatformRequirementFilter;
use Composer\Filter\PlatformRequirementFilter\PlatformRequirementFilterFactory;
use Composer\Filter\PlatformRequirementFilter\PlatformRequirementFilterInterface;
use Composer\Package\BasePackage;
use Composer\Package\AliasPackage;
/**
* @author Nils Adermann <naderman@naderman.de>
* @phpstan-import-type ReasonData from Rule
*/
class RuleSetGenerator
{
/** @var PolicyInterface */
protected $policy;
/** @var Pool */
protected $pool;
/** @var RuleSet */
protected $rules;
/** @var array<int, BasePackage> */
protected $addedMap = [];
/** @var array<string, BasePackage[]> */
protected $addedPackagesByNames = [];
public function __construct(PolicyInterface $policy, Pool $pool)
{
$this->policy = $policy;
$this->pool = $pool;
$this->rules = new RuleSet;
}
/**
* Creates a new rule for the requirements of a package
*
* This rule is of the form (-A|B|C), where B and C are the providers of
* one requirement of the package A.
*
* @param BasePackage $package The package with a requirement
* @param BasePackage[] $providers The providers of the requirement
* @param Rule::RULE_* $reason A RULE_* constant describing the reason for generating this rule
* @param mixed $reasonData Any data, e.g. the requirement name, that goes with the reason
* @return Rule|null The generated rule or null if tautological
*
* @phpstan-param ReasonData $reasonData
*/
protected function createRequireRule(BasePackage $package, array $providers, $reason, $reasonData = null): ?Rule
{
$literals = [-$package->id];
foreach ($providers as $provider) {
// self fulfilling rule?
if ($provider === $package) {
return null;
}
$literals[] = $provider->id;
}
return new GenericRule($literals, $reason, $reasonData);
}
/**
* Creates a rule to install at least one of a set of packages
*
* The rule is (A|B|C) with A, B and C different packages. If the given
* set of packages is empty an impossible rule is generated.
*
* @param BasePackage[] $packages The set of packages to choose from
* @param Rule::RULE_* $reason A RULE_* constant describing the reason for
* generating this rule
* @param mixed $reasonData Additional data like the root require or fix request info
* @return Rule The generated rule
*
* @phpstan-param ReasonData $reasonData
*/
protected function createInstallOneOfRule(array $packages, $reason, $reasonData): Rule
{
$literals = [];
foreach ($packages as $package) {
$literals[] = $package->id;
}
return new GenericRule($literals, $reason, $reasonData);
}
/**
* Creates a rule for two conflicting packages
*
* The rule for conflicting packages A and B is (-A|-B). A is called the issuer
* and B the provider.
*
* @param BasePackage $issuer The package declaring the conflict
* @param BasePackage $provider The package causing the conflict
* @param Rule::RULE_* $reason A RULE_* constant describing the reason for generating this rule
* @param mixed $reasonData Any data, e.g. the package name, that goes with the reason
* @return ?Rule The generated rule
*
* @phpstan-param ReasonData $reasonData
*/
protected function createRule2Literals(BasePackage $issuer, BasePackage $provider, $reason, $reasonData = null): ?Rule
{
// ignore self conflict
if ($issuer === $provider) {
return null;
}
return new Rule2Literals(-$issuer->id, -$provider->id, $reason, $reasonData);
}
/**
* @param BasePackage[] $packages
* @param Rule::RULE_* $reason A RULE_* constant
* @param mixed $reasonData
*
* @phpstan-param ReasonData $reasonData
*/
protected function createMultiConflictRule(array $packages, $reason, $reasonData): Rule
{
$literals = [];
foreach ($packages as $package) {
$literals[] = -$package->id;
}
if (\count($literals) === 2) {
return new Rule2Literals($literals[0], $literals[1], $reason, $reasonData);
}
return new MultiConflictRule($literals, $reason, $reasonData);
}
/**
* Adds a rule unless it duplicates an existing one of any type
*
* To be able to directly pass in the result of one of the rule creation
* methods null is allowed which will not insert a rule.
*
* @param RuleSet::TYPE_* $type A TYPE_* constant defining the rule type
* @param Rule $newRule The rule about to be added
*/
private function addRule($type, ?Rule $newRule = null): void
{
if (!$newRule) {
return;
}
$this->rules->add($newRule, $type);
}
protected function addRulesForPackage(BasePackage $package, PlatformRequirementFilterInterface $platformRequirementFilter): void
{
/** @var \SplQueue<BasePackage> */
$workQueue = new \SplQueue;
$workQueue->enqueue($package);
while (!$workQueue->isEmpty()) {
$package = $workQueue->dequeue();
if (isset($this->addedMap[$package->id])) {
continue;
}
$this->addedMap[$package->id] = $package;
if (!$package instanceof AliasPackage) {
foreach ($package->getNames(false) as $name) {
$this->addedPackagesByNames[$name][] = $package;
}
} else {
$workQueue->enqueue($package->getAliasOf());
$this->addRule(RuleSet::TYPE_PACKAGE, $this->createRequireRule($package, [$package->getAliasOf()], Rule::RULE_PACKAGE_ALIAS, $package));
// aliases must be installed with their main package, so create a rule the other way around as well
$this->addRule(RuleSet::TYPE_PACKAGE, $this->createRequireRule($package->getAliasOf(), [$package], Rule::RULE_PACKAGE_INVERSE_ALIAS, $package->getAliasOf()));
// if alias package has no self.version requires, its requirements do not
// need to be added as the aliased package processing will take care of it
if (!$package->hasSelfVersionRequires()) {
continue;
}
}
foreach ($package->getRequires() as $link) {
$constraint = $link->getConstraint();
if ($platformRequirementFilter->isIgnored($link->getTarget())) {
continue;
} elseif ($platformRequirementFilter instanceof IgnoreListPlatformRequirementFilter) {
$constraint = $platformRequirementFilter->filterConstraint($link->getTarget(), $constraint);
}
$possibleRequires = $this->pool->whatProvides($link->getTarget(), $constraint);
$this->addRule(RuleSet::TYPE_PACKAGE, $this->createRequireRule($package, $possibleRequires, Rule::RULE_PACKAGE_REQUIRES, $link));
foreach ($possibleRequires as $require) {
$workQueue->enqueue($require);
}
}
}
}
protected function addConflictRules(PlatformRequirementFilterInterface $platformRequirementFilter): void
{
/** @var BasePackage $package */
foreach ($this->addedMap as $package) {
foreach ($package->getConflicts() as $link) {
// even if conflict ends up being with an alias, there would be at least one actual package by this name
if (!isset($this->addedPackagesByNames[$link->getTarget()])) {
continue;
}
$constraint = $link->getConstraint();
if ($platformRequirementFilter->isIgnored($link->getTarget())) {
continue;
} elseif ($platformRequirementFilter instanceof IgnoreListPlatformRequirementFilter) {
$constraint = $platformRequirementFilter->filterConstraint($link->getTarget(), $constraint, false);
}
$conflicts = $this->pool->whatProvides($link->getTarget(), $constraint);
foreach ($conflicts as $conflict) {
// define the conflict rule for regular packages, for alias packages it's only needed if the name
// matches the conflict exactly, otherwise the name match is by provide/replace which means the
// package which this is an alias of will conflict anyway, so no need to create additional rules
if (!$conflict instanceof AliasPackage || $conflict->getName() === $link->getTarget()) {
$this->addRule(RuleSet::TYPE_PACKAGE, $this->createRule2Literals($package, $conflict, Rule::RULE_PACKAGE_CONFLICT, $link));
}
}
}
}
foreach ($this->addedPackagesByNames as $name => $packages) {
if (\count($packages) > 1) {
$reason = Rule::RULE_PACKAGE_SAME_NAME;
$this->addRule(RuleSet::TYPE_PACKAGE, $this->createMultiConflictRule($packages, $reason, $name));
}
}
}
protected function addRulesForRequest(Request $request, PlatformRequirementFilterInterface $platformRequirementFilter): void
{
foreach ($request->getFixedPackages() as $package) {
if ($package->id === -1) {
// fixed package was not added to the pool as it did not pass the stability requirements, this is fine
if ($this->pool->isUnacceptableFixedOrLockedPackage($package)) {
continue;
}
// otherwise, looks like a bug
throw new \LogicException("Fixed package ".$package->getPrettyString()." was not added to solver pool.");
}
$this->addRulesForPackage($package, $platformRequirementFilter);
$rule = $this->createInstallOneOfRule([$package], Rule::RULE_FIXED, [
'package' => $package,
]);
$this->addRule(RuleSet::TYPE_REQUEST, $rule);
}
foreach ($request->getRequires() as $packageName => $constraint) {
if ($platformRequirementFilter->isIgnored($packageName)) {
continue;
} elseif ($platformRequirementFilter instanceof IgnoreListPlatformRequirementFilter) {
$constraint = $platformRequirementFilter->filterConstraint($packageName, $constraint);
}
$packages = $this->pool->whatProvides($packageName, $constraint);
if ($packages) {
foreach ($packages as $package) {
$this->addRulesForPackage($package, $platformRequirementFilter);
}
$rule = $this->createInstallOneOfRule($packages, Rule::RULE_ROOT_REQUIRE, [
'packageName' => $packageName,
'constraint' => $constraint,
]);
$this->addRule(RuleSet::TYPE_REQUEST, $rule);
}
}
}
protected function addRulesForRootAliases(PlatformRequirementFilterInterface $platformRequirementFilter): void
{
foreach ($this->pool->getPackages() as $package) {
// ensure that rules for root alias packages and aliases of packages which were loaded are also loaded
// even if the alias itself isn't required, otherwise a package could be installed without its alias which
// leads to unexpected behavior
if (!isset($this->addedMap[$package->id]) &&
$package instanceof AliasPackage &&
($package->isRootPackageAlias() || isset($this->addedMap[$package->getAliasOf()->id]))
) {
$this->addRulesForPackage($package, $platformRequirementFilter);
}
}
}
public function getRulesFor(Request $request, ?PlatformRequirementFilterInterface $platformRequirementFilter = null): RuleSet
{
$platformRequirementFilter = $platformRequirementFilter ?: PlatformRequirementFilterFactory::ignoreNothing();
$this->addRulesForRequest($request, $platformRequirementFilter);
$this->addRulesForRootAliases($platformRequirementFilter);
$this->addConflictRules($platformRequirementFilter);
// Remove references to packages
$this->addedMap = $this->addedPackagesByNames = [];
$rules = $this->rules;
$this->rules = new RuleSet;
return $rules;
}
}